Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade5a157aec35f3b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 21:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67a09b774be07cd1afba05d05c2cdbb6 SHA-1: d666fa77287c03858b2283a876ecd1bf75aa569f SHA-256: ade5a157aec35f3b74a92145ab5d5917aec038eee8c80bca93a28863077dc1d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous URLs, several of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dzwigipoznan.pl/userfiles/file/rudiw.pdf In PDF document text
    • http://movesearchesuk.com/userfiles/file/tabigixiduv.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c129cf2dcd5---35459848052.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/32177152164.pdfIn PDF document text
    • https://istanajp2.com/contents//files/93869368471.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/gimerotusowebogamebagugar.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/44875948018.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/85f2c012bf960489aa0e5ec00a36d9ad/97420421166.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///61988338841.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/sawexasavemi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a131244166ae721233a03fb4e3c681ab/36020504982.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160703baa95c09---kapuwe.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/paruwexisosevuxis.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/jumalaxizobelaxozevotuxo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5cc0c4f7b---jedegelunofexatejixesi.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/wipewekitirokexeb.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/61331096830.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/buxewagupasa.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/76370565608.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/54906815014.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-25-09-12-33-49.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b501e836276095111da9933308f584e6/zaberigul.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/95954343560.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160952c0f79b11---35600669330.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/fbf39eca257d94d35f13631468740129/butak.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/40e61bf0b89128e567ad1f997a7ee96f/vebedadufuweno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ipr+biosafety+and+bioethics+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 19156 bytes
SHA-256: 6a630dada9d9a06e9a9d89844e4d34d765d94361b4449a6ea76cbf98cdfd632a
font_01_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 11008 bytes
SHA-256: 6face70a81cf2be0f8a30c9f70d379dccb8923fc3e572a93204a68e74af9e981

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